Another site:
AllTop 200 most popular tests to learn English...
1) Test de niveau anglais (webmaster) 6 785 606
2) Placement test : grammar for beginners (lucile83) 6 005 135
3) A/AN (webmaster) 5 373 237
4) Auxiliary BE (webmaster) 3 228 161
5) Present continuous (webmaster) 3 004 503
6) Present simple (webmaster) 2 929 482
7) Present simple (webmaster) 2 602 295
8) Present continuous (webmaster) 2 443 011
9) Adjectives (webmaster) 2 096 051
10) A/an (anonyme) 2 019 997
11) Present perfect simple (webmaster) 1 652 728
12) Preterite (webmaster) 1 639 444
13) Vocabulary - Placement test (bridg) 1 621 479
14) Preterite (webmaster) 1 454 579
15) Short placement test (webmaster) 1 445 573
16) To be (bridg) 1 408 806
17) Present perfect (webmaster) 1 353 716
18) What time is it? (webmaster) 1 351 775
19) The alphabet in English (webmaster) 1 323 474
20) Adjectives (lucile83) 1 218 389
21) What time is it? (webmaster) 1 212 554
22) Numbers (webmaster) 1 189 985
23) 'A' ou 'An' (anonyme) 1 178 928
24) Two presents: present continuous, present simple (webmaster) 1 152 481
25) To be (bridg) 1 147 647
26) Comparatives / Superlatives (webmaster) 1 112 473
27) Numbers (webmaster) 1 072 975
28) CAN / MUST (webmaster) 1 060 385
29) THE/ A / AN / nothing (webmaster) 1 037 333
30) Comparatives (webmaster) 1 008 845
31) Family life (bridg) 1 002 835
32) Numbers > 100 (webmaster) 987 967
33) Future (going to/will/present continuous) (anonyme) 967 400
34) Plural (webmaster) 957 662
35) Superlatives (webmaster) 877 086
36) Adjectives (anonyme) 876 571
37) Simple present (bridg) 856 029
38) Spelled words N°1 (bridg) 851 994
39) Placement test beginners: Check your spelling (lucile83) 831 152
40) Introducing oneself (webmaster) 828 394
41) Adverbs of frequency (lucile83) 820 238
42) Family (bridg) 786 384
43) Present simple (lucile83) 784 736
44) General test-End of high school / Beginning of university (webmaster) 784 553
45) Frequency adverbs (webmaster) 779 287
46) Present BE + Ving (bridg) 767 652
47) Passive form (lucile83) 734 681
48) Genitive (webmaster) 724 832
49) Family tree (anonyme) 720 785
50) Preterite: simple or continuous? (webmaster) 719 179
51) Placement test (beginners) (lili73) 703 365
52) Past simple or present perfect (lucile83) 698 578
53) Future (webmaster) 677 053
54) Present perfect simple (bridg) 666 339
55) 2 Preterites (webmaster) 664 501
56) Preterite (webmaster) 623 418
57) List of 200 irregular verbs and audio (bridg) 618 049
58) Modals (webmaster) 613 814
59) Spelled words N°2 (bridg) 610 597
60) Modals (webmaster) 609 433
61) Height (webmaster) 607 263
62) Articles a / an / the (lucile83) 596 826
63) Plural forms (bridg) 579 145
64) Nationalities (webmaster) 575 481
65) Past continuous / Past simple (anonyme) 570 931
66) Irregular plurals (bridg) 555 137
67) Two presents: simple and continuous (webmaster) 550 863
68) Preterite (bridg) 550 569
69) Superlatives (frapedur) 543 510
70) Vocabulary: greeting people (here4u) 536 622
71) Give your opinion (bridg) 533 273
72) Adverbs of Frequency (bridg) 518 103
73) Present simple or continuous (lucile83) 514 264
74) Present perfect / preterite ? (anonyme) 513 698
75) Possessive case (anonyme) 481 753
76) Countries & nationalities (bridg) 474 770
77) Past tenses (bridg) 472 688
78) 'The' or nothing? (webmaster) 472 080
79) Introducing oneself (easy) (webmaster) 471 569
80) Passive voice (webmaster) 465 538
81) Present Simple vs. Past Simple (anonyme) 461 469
82) Questions : how to ask them (lucile83) 449 419
83) General Test II / End of high school / Beginning of universi (webmaster) 447 252
84) IN, ON, AT or TO? (webmaster) 446 846
85) Relative pronouns (webmaster) 446 707
86) Comparative of superiority (lucile83) 441 266
87) How to pronounce the final -ED? (past simple) (webmaster) 440 066
88) Relative clauses (webmaster) 424 487
89) Sounds: [h] (webmaster) 420 212
90) Comparative (anonyme) 415 826
91) Past simple (anonyme) 401 959
92) A/an/Ø (bridg) 400 081
93) Future simple (lucile83) 398 282
94) This / That / These / Those (webmaster) 393 399
95) Conditional (webmaster) 393 159
96) Passive voice (anonyme) 392 320
97) Comparing (webmaster) 388 794
98) Can / could/ may/ might (woodyrun) 381 177
99) Present perfect or past tense (anonyme) 379 808
100) Much, many, little and few (felin) 375 494
101) Personal pronouns (anonyme) 371 777
102) Preterite continuous (BE + -ING) (webmaster) 371 651
103) Genitive case (bridg) 369 302
104) Some, any, no, enough, too/too much/too many (webmaster) 368 889
105) Confusing words - Placement test (bridg) 365 074
106) Irregular verbs (webmaster) 364 831
107) Numbers from 1 to 10 (lucile83) 362 235
108) Past perfect simple, past perfect continuous (anonyme) 361 349
109) Present continuous or present simple (webmaster) 360 282
110) Present perfect or preterite? (anonyme) 359 580
111) Simple Past : regular verbs (anonyme) 355 493
112) Comparative Adjectives (bridg) 352 896
113) Who, Whom, Which, or Whose? (anonyme) 350 223
114) Past simple (video) (lucile83) 349 922
115) Past simple or past continuous (lucile83) 346 486
116) While / When (anonyme) 341 444
117) What time is it? (webmaster) 338 891
118) Modals (tinou) 337 395
119) Modal: may/might (lucile83) 334 907
120) Cardinal and ordinal numbers (anonyme) 329 491
121) The superlative (anonyme) 328 292
122) Possessive adjectives and pronouns (woodyrun) 325 195
123) How to talk about the weather (lili73) 321 000
124) Since and for (lucile83) 320 218
125) Flags (webmaster) 318 280
126) Irregular verbs (bridg) 316 929
127) Pronouns (woodyrun) 315 810
128) Prepositions - in, on, at (anonyme) 314 697
129) Tenses (anonyme) 313 287
130) Placement test 3 (webmaster) 311 080
131) Order of adjectives (webmaster) 307 264
132) Could/Couldn't (laure95) 306 974
133) Comparative (anonyme) 305 510
134) Agreement Tags (webmaster) 304 661
135) Adjectives and prepositions (lucile83) 304 645
136) Asking questions (webmaster) 303 835
137) Present perfect OR simple past? (bridg) 298 967
138) Questions in the past tense (lucile83) 298 801
139) Uncountable nouns (webmaster) 296 727
140) Superlative Adjectives (bridg) 296 669
141) Object pronouns (bridg) 296 592
142) Passive form (anonyme) 294 991
143) Placement test 1 (lucile83) 293 588
144) Present simple (lucile83) 292 510
145) Can/Must/Should (laure95) 292 031
146) Past perfect (lili73) 291 592
147) Prefer/rather (bridg) 290 338
148) Must or Have to? (woodyrun) 288 891
149) The/an/nothing (bridg) 286 008
150) To be (anonyme) 283 691
151) Can and can't (laure95) 283 525
152) Vocabulary: asking and answering (here4u) 280 507
153) Modal verbs (bridg) 277 810
154) Some / Any / no... (bridg) 275 449
155) Days of the week (bridg) 269 231
156) So / neither (anonyme) 264 686
157) Past simple (video) (lucile83) 264 324
158) Present continuous (chnawa) 262 767
159) Should / must (anonyme) 260 686
160) Used to (bridg) 260 666
161) Past tense (anonyme) 259 902
162) Articles : a / an / the / Ø (anonyme) 259 163
163) Vocabulary: on the phone (here4u) 258 866
164) Find out a quantity (webmaster) 258 837
165) Superlative + and adjective (lucile83) 258 094
166) Comparative and superlative (anonyme) 257 922
167) Numbers 1/100 (anonyme) 254 125
168) Modal can (video) (lucile83) 253 509
169) Comparatives (anonyme) 252 102
170) Relatives pronouns (who, which, that...) (anonyme) 247 921
171) A few, a little, few, little (anonyme) 246 637
172) Vocabulary: at the restaurant (here4u) 245 724
173) Would rather / would prefer to (anonyme) 245 055
174) Present continuous and the Going to form (anonyme) 243 459
175) Should/ have to/ must (anonyme) 241 505
176) Have something done (anonyme) 240 206
177) Used to/would (woodyrun) 238 620
178) The past (webmaster) 238 101
179) Future continuous and future perfect. (felin) 238 097
180) How to ask a question in English (bridg) 236 396
181) Pluperfect (webmaster) 234 680
182) Some / any (younes91) 234 505
183) I wish, if only (felin) 234 498
184) Countable or Uncountable? (webmaster) 234 035
185) Should / shouldn't (anonyme) 232 233
186) Present simple or continuous (bridg) 230 841
187) Adjectives - ing and ed (felin) 229 905
188) Hypothesis (webmaster) 228 817
189) Must or mustn't (laure95) 227 365
190) Auxiliary BE (lucile83) 226 776
191) Articles a/an/the/0 (bridg) 226 511
192) Article The or nothing (anonyme) 226 392
193) Present perfect with Ever - never - (anonyme) 226 383
194) Present continuous OR Present simple? (bridg) 225 864
195) Simple Preterite OR Preterite (BE+ing) (webmaster) 223 233
196) Comparison (komiks) 221 937
197) To / in order to / so as to / so that (irish21) 221 422
198) Present perfect (bridg) 219 892
199) Indirect speech (bridg) 218 395
200) What time is it ? (anonyme) 218 007
